had my Zepto 6625WD repaired quickly and efficiently. To replace mobo/gpu, was GBP117.50 inc courier to and from my door. Don't know if could have found it cheaper, but seeing as Zepto went out of business in 2009, just pleased to have had it done at all, and the work is guaranteed for a year.
only downer was the admin side of their business - comms could have been better, esp about a payment issue that I only found out about when phoning them about delivery. Would still use them again, but am hoping they make things better on that side.
my 2c
http://www.cambridgelaptoprepair.co.uk